Don't make the mistake of assuming those posters are at all legitimate. Holla Forums's interest in national social comes from a more complete understanding of a variety of circumstances, not simply because "LOL BEING A NAZI IS EPIC XDDD HAIL HORTLER!"
Also consider the following: Leftists almost universally have a great deal of trouble comprehending the beliefs of their opponents. They are of the mind that theirs is the most rational, realistic ideology, and all others are insane, unhinged extremists who only feel irrational hatred and nothing else. They refuse to accept the reasoning behind the beliefs of others, so instead, they construct these elaborate strawmen. Elaborate, but not at all good.
For instance: Feminism. Feminists can't understand why anyone would hate their idiotic movement which only serves to amass power and wealth for opportunistic harpies. So they just assume that anyone who is anti-feminism must be a woman hating, Elliot Rogers-esque, lonely perma-virgin psychopath who believes all women deserve to be beaten into submission and then chained to the stove, because they belong in the kitchen. Furthermore, they assume that anti-feminists are threatened by feminism, so they lash out because they don't want to somehow lose the abstract concept of social power to women.
But anti-feminists, even the MRA fedora-tipping plebbitor types, aren't like this. Not even on their worst days.. Which brings me to my next point: When they can't find something that confirms their moronic assumptions, they go out of their way to make it seem real, for the sake of their desperate ideological allies. They fake it. Sock puppet it, even. Send death threats to their friends. They see an "ally" getting their shit kicked in by someone with a better grasp on a variety of topics, so they rush to their defense… by sending anonymous hatemail and death threats. Sometimes to themselves. To them, this is seen as a winning move. It makes them look like the victim, but it allows them to assume that they are being attacked, which must mean that they are right about something and their enemies are wrong because they resorted to aggressive tactics… Nevermind that lefty ideology deifies aggressive tactics and employs them constantly.
This brings me back to the extreme nazis we've seen pop up over the last few weeks. I browse Holla Forums enough to know that there are some nazi types, but none of them are so foolish or so antagonistic that they'd lose their shit over the idea that Trump is not a 1488'ing, Heiling, Degenerate gassing, Jew exterminating, Neo-Hitler.
With the previous points in mind, ask yourself.. Who is going to act like they are outraged by Trump playing by the book and following the rules of government, and not immediately resorting to extremist fascist tactics? The veteran Holla Forums user who understands that National Socialism is an eventual goal… Or the ass ravaged Holla Forums shill who thinks they can stir dissent and disrupt Holla Forums by pretending to be the most extreme "how do you do fellow Nazis!" NatSoc, Fashy Holla Forumsack who is angry that Trump isn't Holla Forums-incarnate?